LinearProgressIndicator class Null safety
A Material Design linear progress indicator, also known as a progress bar.
A widget that shows progress along a line. There are two kinds of linear progress indicators:
- Determinate. Determinate progress indicators have a specific value at each point in time, and the value should increase monotonically from 0.0 to 1.0, at which time the indicator is complete. To create a determinate progress indicator, use a non-null value between 0.0 and 1.0.
- Indeterminate. Indeterminate progress indicators do not have a specific value at each point in time and instead indicate that progress is being made without indicating how much progress remains. To create an indeterminate progress indicator, use a null value.
The indicator line is displayed with valueColor, an animated value. To
specify a constant color value use: AlwaysStoppedAnimation<Color>(color)
.
The minimum height of the indicator can be specified using minHeight. The indicator can be made taller by wrapping the widget with a SizedBox.
This example shows a LinearProgressIndicator with a changing value.
To create a local project with this code sample, run:
flutter create --sample=material.LinearProgressIndicator.1 mysample
flutter create --sample=material.LinearProgressIndicator.1 mysample
See also:
- CircularProgressIndicator, which shows progress along a circular arc.
- RefreshIndicator, which automatically displays a CircularProgressIndicator when the underlying vertical scrollable is overscrolled.
- material.io/design/components/progress-indicators.html#linear-progress-indicators
- Inheritance
-
- Object
- DiagnosticableTree
- Widget
- StatefulWidget
- ProgressIndicator
- LinearProgressIndicator
Constructors
Properties
- backgroundColor → Color?
-
Color of the track being filled by the linear indicator.
read-onlyoverride
- color → Color?
-
The progress indicator's color.
finalinherited
- hashCode → int
- The hash code for this object.
- key → Key?
-
Controls how one widget replaces another widget in the tree.
finalinherited
- minHeight → double?
-
The minimum height of the line used to draw the linear indicator.
final
- runtimeType → Type
-
A representation of the runtime type of the object.
read-onlyinherited
- semanticsLabel → String?
-
The SemanticsProperties.label for this progress indicator.
finalinherited
- semanticsValue → String?
-
The SemanticsProperties.value for this progress indicator.
finalinherited
- value → double?
-
If non-null, the value of this progress indicator.
finalinherited
-
valueColor
→ Animation<
Color?> ? -
The progress indicator's color as an animated value.
finalinherited
Methods
-
createElement(
) → StatefulElement -
Creates a StatefulElement to manage this widget's location in the tree.
inherited
-
createState(
) → State< LinearProgressIndicator> -
Creates the mutable state for this widget at a given location in the tree.
override
-
debugDescribeChildren(
) → List< DiagnosticsNode> -
Returns a list of
DiagnosticsNode
objects describing this node's children.protected">@protectedinherited -
debugFillProperties(
DiagnosticPropertiesBuilder properties) → void -
Add additional properties associated with the node.
inherited
-
noSuchMethod(
Invocation invocation) → dynamic -
Invoked when a non-existent method or property is accessed.
inherited
-
toDiagnosticsNode(
{String? name, DiagnosticsTreeStyle? style}) → DiagnosticsNode -
Returns a debug representation of the object that is used by debugging
tools and by DiagnosticsNode.toStringDeep.
inherited
-
toString(
{DiagnosticLevel minLevel = DiagnosticLevel.info}) → String -
A string representation of this object.
inherited
-
toStringDeep(
{String prefixLineOne = '', String? prefixOtherLines, DiagnosticLevel minLevel = DiagnosticLevel.debug}) → String -
Returns a string representation of this node and its descendants.
inherited
-
toStringShallow(
{String joiner = ', ', DiagnosticLevel minLevel = DiagnosticLevel.debug}) → String -
Returns a one-line detailed description of the object.
inherited
-
toStringShort(
) → String -
A short, textual description of this widget.
inherited
Operators
-
operator ==(
Object other) → bool -
The equality operator.
nonVirtual">@nonVirtualinherited